Double head hemming machine



July 15, 1-941. J. 'GALKIN DOUBLE HEAD HEMMING MACHINE 4 Sheets-Sheet 2 Filed April 14,. ess

JOSEPH GALKIN INVENTOR. BYM

ATTORNEY.

Jul 15, 1941. J. GAL-KIN 2,249,423

DOUBLE HEAD HEMMING MACHINE Filed April 14, 1939 4 Sheets-Sheet 3 I F 1 a 2 I: In

S I 0 /N 4 r as 8 n a: 2 Ln N N s S 0 =2 a O o 00 FR m p.

JOSEPH GALKIN' INVENTOR.

ATTORNEY.

July 15,1941, i -.1. GALKIN 2,249,423

' ncusm HEAD'HEMMING MACHINE Fil ed April 14, 1939 4 Sheets- Sheet 4 G o m M Ln 8 1 I Q o,

JOSEPH GALKIN INVENTOR.

ATTORNEY.

Patented July 15, 1941 UNITED STATES PATENT QFFICE 2,249,423 DOUBLE HEAD HEMMING MACHINE Joseph Galkin, New York, N. Y. Application April 14, 1939, Serial No. 267,805

3 Claims.

This invention relates to double-head hemming machines designedto feed in the same direction for making two parallel lines of stitching simultaneously.

An object of this invention is to produce an efilcient and practical double head sewing machine for simultaneously sewing two parallel rows of zig-zag stitches at the opposite edges of a piece of fabric.

Another object of this invention is to mount the two sewing machines on a table having a drive-shaft rearward of the sewing machines and to provide means whereby each of said machines may-be swung above the table for bringing the normally concealed mechanism below the sewing machine base into fully accessible position.

Another object of this invention is to provide an external belt drive for driving the main shaft of the sewing machine from the said rearwardly positioned drive-shaft and so that the said belt drive will remain operatively connected during the swinging motion. p

Another object of this invention is to provide each sewing machine with a lever actuated shears mounted on the base of and integralwith the sewing machine and having a chain passing through the base of the sewing machine and enaging one end of the lever for actuating the shears from below the slideway.

Another object of this invention is to provide spring-pressed latching means forautomatically locking each sewing machine in its rearward angular position above the slideway.

.With the above and other objects in view,-the invention will be hereinafter more particularly described, and the combination and arrangement of parts will be shown in the accompanying drawings and pointed out inthe claims which form part of this specification. I v 7 Reference will now be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure 1 is a front elevation of a double head sewing machine embodying the invention; Figure 2 is a plan view of the invention. Figure 3 is a cross-sectional view, the section being taken as on line 33 in Figure-2 and showing the sewing machines in operating positionon the slideway.

- Figure 4 is a cross-sectional Figure 3 and showing one of the sewing machines swung-about the drive-shaft as an axis and in angular relation with the slideway -i Figure 5 is a perspective view of a shear used for cutting the thread of one of the sewing machines.

Figure 6 is a fragmentary cross-sectional view; the section-being taken as on, line 6-6 in Figure 2. r Y

view similar to r In the illustrated embodiment of the invention the numeral It denotes a supporting-table mounted upon side frames l I, l l and firmly supporting two sewing machines I2l2 which may be of any suitable character. The machines l2, l2 illustrated in'the drawings are known in the art as Singer zig-zag sewing machines. The machines are arranged in alinement with and face one another. The feeding mechanisms (not shown) of the sewing-machines are arranged to feed in the same direction, and this result may be accomplished in a well-known manner by reversing the throw of the feed-of one -machine. Rearward of the table l8 and rearwards of the sewing machines is mounted in suitable bearings l3, l3 the main drive-shaft I4, which receives its power from a belt l5 connected to an electric motor IE. The drive-shaft l4,;adjacent the ma-- chine l2 has mounted upon it a toothed wheel l l. The main shaft l8 of the machine I2 is provided with a toothed wheel 19 to receive a belt 20 by which the wheels I land I9, ar connected and through the medium of-which motion is communicated from the drive-shafts! for imparting power. to themain shaft l8 of the sewing inachinel2 v,

The drive-shaft l4, adjacentthe machine I2 has mounted upon it a gear 2i. A gear?! has been mounted on'a stubs'haft 2 3 and in meshed engagement with the gear 2lso as to rotate in O posite directions. Thegear 22 has integrally secured thereto a toothed wheel l l The main shaft l8 of the machine IZ is provided witha toothed wheel l9 'to receive a belt 20 by which the wheels I1 and l9 -are connected and through the medium of which motion is communicated from the, drive-shaft, Mfor imparting power. to the main shaftlii of the sewing machine I2 It is. to be "noted that .the distances between the center lines of the toothed wheels I! and I5, and ll ..and I9 are identical and that both sewing machines are timed ,to feed equally in the same direction. I :1 e

.The supporting table It comprises angleirons :25 secured .tothe top of the side frames ll.

" Rectangular bars 25 ifastenedto the'inner faces 60; The belt 20 is preferably made of -the upright legsoftheang-leirons 25 form a slideway 21 on which I. the; bases 28 and28' of the sewing,machines restl .1 v

Secured to the upper. face ofthe base 28 of the sewing machine |2 is g-a rearwardly and downwardly extending bracket 33. The bracket 30 -.has, aperture means. 3! at'iits rear end portion which serves to engage the drive-shaft M. It will thus be notedby reference to-Figure 3, that the sewing machine l2 =may be swung rearwardly about the drive-shaft Hi and that during the swingingmotion the belt 26 remains in timed relation. Y

of canvas and shaft H4. The bracket supports the stub shaft 23, the wheel [1' and gear 22 and the gear 2| (not shown) on the drive-shaft l4.

As shown in Figures 3 and 4, a latch 66 has been mounted on a pivot 4| and is resiliently pressed by a spring 42 in direction of a rectangular bar 25 in the slide-way '21. As shown in Figure 3, the sewing machine [2 may be swung about the drive-shaft 14 until an angular extension 43 engages the lower face of the bar 26 and prevents any further outward swing of the sewing machine. There has thus been provided spring-pressed means for latching the sewing machine l2 in angular relation with the slideway 21.

As shown in Figures 3 and 4, an extension 45 A chain (not shown) passing through an aperture in the base 28' is secured at its upper end to the operating lever of the shear G5 and at its lower end to the bar 58. Both shears are thus operated simultaneously by the 'foot pedal 63 it is to be noted that the drive-shaft M has an elongated keyway 66 in engagement with a key 61 in the toothed wheel I'!. It will thus be seen that the main shaft iii of the sewing machine i2 is rotatable by thedrive-shaft M in from the bracket 3!! has a roller 46 rotatably mounted therein. It is to be noted that before the sewing machine I2 is swung about the drive shaft I 4, the chain 56 is unhooked at its lower end from a hook 85 at the upper end of the pendant plate 51. The roller 46, shown in Figure 3, is designed to engage the upper surface of the horizontal leg of one of the angle irons 25 and transmits the load of the overhanging sewing machine to said angle iron. The roller 46 relieves the drive-shaft M of the weight of the overhanging sewing machine, and inactual practice, the overhanging machine may be freely rotated while in the angular position and this is of great importance in the maintenance of the two sewing machines. p

The sewing machine [2 has a thread cutting shear 50 fastened to the upper surface .of the base, behind the head of the sewing machine. Theshear 5.0 has a blade 5| pivotally mounted in a bracket '52 to swing ,in a vertical plane. A stationary blade .53 lying flat on the base coacts with the movable blade 5|. A lever 54 pivotally mounted in an upright extension of the bracket 52 has one of its ends substantially ball shaped and seating in a slot in the movable blade.

Operating movement of the shear'50 is effected by a chain 56 secured to the free end of the lever and which passes through an aperturein the base 28 and projects downwardly therefrom. At the lower end of the chain 56 is a pendant plate 51 which is in suitable engagement with a bar 58 running parallel with the slideway 21, as best shown in Figure 3.

The bar 58 is secured to a rod 59 which is pivotally mounted to swing about a shaft 60. The shaft 60 is rotatably mounted in bearings 6| secured to the lower face of one of the angle irons 25. A rod 62 extending downwardly from the rod 59 to a foot pedal 63 provides m'eans for actuating the shear 50. Y

The sewing machine l2 has a shear 65, similarto the shear 50 fastened to the upper 'sur face of the base 28', behind the head of the sewing machine. The shear 65 is a left hand shear as distinguished from. the right hand shear 50. 75.

all its slidable positions.

Figure 6 shows an arcuate shield If! superposed over the drive-shaft Hi. The shield 10 may be supported by angular members (I secured to one of the angle'irons 25. A complementary shield 12 has been slidabl'y mounted over the shield 19. The shield 12 is in practice secured to the slidable sewing machine 12. The shield 12 is flexible, due to its large length from the point of support on said slidablesewing machine. As best shown in Figure 6, the shield 12 is secured to the slidable sewing machine l2 by a connecting member 90 well known 7' in the art. The two shield sections are thus relatively shifted automatically with the relative movement between the sewing machines.

Two edge guides 13, 13', have been secured to the bases 28, 28' and serve for receiving the opposite sideedges'of a strip of fabric which is brought to a roll holder I5 in front of the table It rolled up and with both side hems folded. The guides are fastened to the bases adjacent the needles of the sewing machines. The distance between the edge guides corresponds to the overall dimension between the folded hems of the strip of fabric. I

When the full length of the strip of fabric has been hemmed, the operator actuates the foot treadle 63 and the two thread-cutting shears 5D and '65 out both threads simultaneously. A foot treadle 15 has a treadle rod 11 extending upwardly to a lever 18 which operates a clutch (not shown) in the electric motor l6 and serves for starting and stopping the drive-shaft and both sewing machines. The drive-shaft is driven from the motor [5 by the belt l5 passing over pulleys 19 and 80.

As best shown in Figure 3, the slidable sewing machine 12 has a shaft '81 rotatably mounted in bearings 82, 82 secured to the base 28. A gear 83 is secured to the shaft SI and meshes with a rack gear 84 secured to the front face of one of the angle irons 25. A handwheel 85 secured to the outer end of the shaft 8| serves for rotating the shaft and thereby causing slidable motion of the sewing machine I2 on the slideway 21 so as to .accommodate strips of fabric of different dimensions between the hemmed side edges.

I claim: v g

1. In a machine of the character described, comprising a table having a slideway and two sewing machines relatively slidable on said slide way and adapted to feed in the same direction, said sewing machines having main shafts above said slideway, a drive-shaft rotatably mounted on said table rearwards of said sewing machines, said drive-shaft having a key lengthwise thereof, a bracket extending from each of said machines; said brackets being respectively fixed to said machines and having means for supporting said drive-shaft, whereby each of said machinesmay be swung above said slideway for bringing the normally concealed mechanism below the sewing machine base into fully accessible position, a-gar operatively associated with said drive-shaft, a gear secured to said sewing machine main shaft, a fabric belt having spaced metallic projections fixed thereto and meshing with the teeth of the gear wheels mounted on said sewing machine shafts and said drive shaft and forming a belt drive externally of said sewing machine, said external belt drive being operatively connected during said swinging motion and one of said machines being slidable relative to said drive-shaft jointly with its coacting belt drive, said sewing machines having work supporting bases, said drive shaft being mounted below the level of said work supporting bases, said drive shaft being shielded on three sides and comprising a shield superposed over said drive shaft, said shield comprising complementary relatively slidable sections, said sections being shifted automatically with the relative movement between said sewing machines, and a rack-bar fixed to the front face of said slideway with its teeth on its upper side, a shaft rotatably mounted on top of the work supporting base of one of said sewing machines and having a gear secured thereto and in engagement with said teeth, and means for rotating said gear and causing said mentioned sewing machine to travel along said slideway, said slideway having a horizontal surface at the rear thereof, said bracket having a roller rotatably mounted at its lower end and adapted for engagement with said surface in the overhanging position of said sewing machine, for relieving said drive shaft from supporting the weight of said sewing machine and permitting free rotation of said drive shaft.

2. In a machine of the character described, comprising a table having a slideway and two sewing machines mounted in spaced relation on said slideway and adapted to feed in the same direction, said sewing machines having main shafts above said slideway, a drive-shaft rotatably mounted on said table rearwards of said sewing machines, one of said machines being slidable on said slideway, a portion of said driveshaft rearwards of said slidable machine having a key lengthwise thereof, a bracket extending from each of said machines and having a bearing fixed to the upper surface of the sewing machine base and in engagement with said driveshaft, whereby each of said machines may be swung above said slideway for bringing the normally concealed mechanism below the sewing machine base into fully accessible position, a toothed wheel mounted on and operatively associated with said drive-shaft, a toothed wheel secured to said sewing machine main shaft, a fabric belt having spaced metallic projections fixed thereto and meshing with the teeth of the gear wheels mounted on said sewing machine shafts and said drive shaft and forming a belt drive externally of said sewing machine and superposed over said table, said superposed belt drive being operatively connected during said swinging motion and said slidable machine being slidable relative to said drive-shaft jointly with its coacting belt drive, said sewing machines having work supporting bases, said drive shaft being mounted below the level of said work supporting bases, said drive shaft being shielded on three sides and comprising a shield superposed over said drive shaft, said shield comprising complementary relatively slidable sections, said sections movement between said sewing machines, and a rack-bar fixed to the front face of said slideway with its teeth on its upper side, a shaft rotatably mounted on top of the work supporting base of one of said sewing machines and having a gear secured thereto and in engagement with said teeth, and means for rotating said gear and causing said mentioned sewing machine to travel along said slideway, said slideway having a horizontal surface at the rear thereof, said bracket having a roller rotatably mounted at its lower end and adapted for engagement with said surface in the overhanging position of said sewing machine, for relieving said drive shaft from supporting the weight of said sewing machine and permitting free rotation of said drive shaft.

3. In a double-hemming machine comprising a table having a slideway and two sewing machines mounted on said slideway to face each other and being adapted to feed in the same direction, a drive shaft co-extensive with said slideway and being rotatably mounted rearwards of said slideway, one of said machines being slidable on said slideway, a portion of said driveshait rearwards of said slidable machine having an elongated keyway therein, a bracket fixed to the upper surface of the sewing machine base and extending from each of said machines rearwardly thereof and being in engagement with said drive shaft for mounting said sewing machines in pivotal relation with said drive-shaft, whereby each of said machines may be swung rearwardly into angular relation with said slideway for bringing the normally concealed mechanism below the sewing machine base into fully accessible position, latching said machines in said angular position, said sewing machines having main shafts above said slideway, toothed wheels mounted in operatively associated relation with said drive-shaft,

toothed wheels secured to said sewing machine main shafts, belts having means for engaging with said toothed wheels and forming timed belt drives superposed over said table, said superposed belt drives remaining operatively connected in said timed relation during said swinging motion, said sewing machines having work supporting bases, said drive shaft being mounted below the level of said work supporting bases, said drive shaft being shieldedon three sides and comprising a shield superposed over said drive shaft, said shield comprising complementary relatively slidable sections, said sections being shifted automatically with the relative movement between said sewing machines, and a rack-bar fixed to the front face of said slideway with its teeth on its upper side, a shaft rotatably mounted on top of the work supporting base of one of said sewing machines and having a gear secured thereto and in engagement with said teeth, and means for rotating said gear and causing said mentioned sewing machine to travel along said slideway, said slideway having a horizontal surface at the rear thereof, said bracket having a roller rotatably mounted at its lower end and adapted for engagement with said surface in the overhanging position of said sewing machine, for relieving said drive shaft from supporting the weight of said sewing machine and permitting free rotation of said drive shaft.

JOSEPH GALKIN.

being shifted automatically with the relative spring-pressed means forv 

